test-drb

test-drb@ccmp.vtda.org

101090 discussions

by trag＠io.com

> > Date: Tue, 23 Mar 2010 08:31:13 -0700 > From: Al Kossow <aek at bitsavers.org> > On 3/23/10 4:09 AM, Julian Skidmore wrote: >> >> Alexey Toptygin wrote: >> >>> What's wrong with pulse or async logic designs? I personally find them >>> fascinating, but I've never gotten to play with an implementation of >>> one... Are there problems with designing like this that made people >>> switch >>> to sync designs? Anyone know of any good books on non-synchronous logic >>> design? >> >> Probably the best resources are the Amulet resources from Manchester >> University. >> > > Or the work on logical effort by Ivan Sutherland. I did some contract design work for a company called Theseus (Mumble) back around 2000. Their stuff was all non-clocked logic. They used two rails per bit and depending on how the two rails were coded it represented either 0, 1 or ready (or finished?), if I remember correctly. The logic to signal back the completion and readys about doubled the amount of real estate the logic used, but it could run as fast as the gates allowed, did not have a synchronizing pulse, making remote monitoring attacks difficult to impossible and only used as much power as it needed to process the actual data available. The amount of design discipline needed was substantial, making me wonder if just going to the trouble of implementing more traditional power saving techniques wasn't a better option. Jeff Walther

16 years, 1 month

The Oldest Toshiba Laptop in Portugal

by billdeg＠degnanco.com

There's a contest with a prize of a new Toshiba laptop that goes to the person with the oldest working Toshiba laptop: http://www.facebook.com/toshibaportugal?v=app_7146470109 (it's in Portuguese). You must be a Portuguese citizen. Bill

16 years, 1 month

Leaving computers on...

by bqt＠softjar.se

"Jeremy S. Sharp" <theodric at gmail.com> wrote: > Is there anybody here who keeps classic big(-ish) iron running 24x7? > I've been told a story of a burning PDP-11/34 which has somewhat put > me off any notion of leaving my -8s turned on when I'm not within > reach of a killswitch & fire extinguisher. :) At the moment, nothing more than my 11/93. Current uptime about a month. I used to manage an 11/70 as well. It's still on standby, but powered down most of the time right now because of cooling problems, and electricity bill. (Same with a VAX-8650.) Johnny

16 years, 1 month

Wanted: Graphics card and drive sled for RS/6000 7046-B50

by dm561＠torfree.net

Date: Mon, 22 Mar 2010 18:04:26 -0600 From: Andrew Warkentin <andreww591 at gmail.com> Subject: Wanted: Graphics card and drive sled for RS/6000 7046-B50 >I recently bought an RS/6000 7046-B50. It didn't have a graphics card >installed (I can use it over a serial console, but I would prefer to be >able to use a graphical console). It is also missing the drive sleds. >Does anybody have a graphics card or drive sled that would work with it? ---------- A few days ago I posted here about an RS/6000 available in the Toronto area but there was no interest either here or elsewhere, so it's being scrapped on Thursday. This is an RS/6000 Power Server 520, Type 7013, Model# 26-10855; If it has a graphics card would it fit in yours and what would the number be? And are the sleds compatible? mike

16 years, 1 month

[BBC-Micro] Re-using floppies

by pete＠dunnington.plus.com

On 22/03/2010 19:18, Alex Taylor wrote: > The idea was that reformatting a 1.44MB HD disk in a DD drive will > leave traces of the original formatting behind (as they're always > preformatted for DOS/Windows), causing the unreliability. Using a bulk > eraser is meant to eliminate this problem, as it will turn them into > completely blank disks that can be formatted in a DD drive more > reliably. That won't really matter. When you format a disk you write bit patterns all over it: in the headers, in the data sectors, and even in much of the gaps between them (sync bytes and clock patterns used as markers). Thus there's something there even when you write the first real data, and of course it never lines up exactly, bit for bit. Therefore you still have the problem of interference from the previous "data" even if it's just the dummy data used to fill a "blank" sector, and the sync bytes and markers in the preamble to it. -- Pete Peter Turnbull Network Manager University of York

16 years, 1 month

cctalk Digest, Vol 79, Issue 44

by alhartman＠yahoo.com

I don't know what the market is like in Europe, but I can still buy new media in 5.25" and 3.5" format easily here in the U.S. Google brings up many places here. If there are no such outlets in the UK, maybe you can get a bulk order together with some local folks to save on the shipping costs? Al From: Liam Proven <lproven at gmail.com> Subject: Reusing old floppy *drives* Noting the discussion on old media, a slightly different question. Please excuse my profound ignorance on matters electronic! I have read, somewhere, that it is possible to connect HD floppy drives to elderly kit that is only expecting DD drives, and use them for just DD operation. More specifically, I'd like to resurrect my ancient Sinclair Spectrum with its MGT DISCiPLE disk interface. Way back in the 1980s, I used 5?" media, as they were still cheaper. However, now, I daresay I won't find any new 5?" media and even 3?" DD media are getting tricky. So what I was considering doing was connecting a pair of old PC floppy drives - 3?" HD (1.4MB) floppies - and quite possibly using 1.4MB media, but only formatting them to 720K and using them as 720K. IIRC, the drives permit this. The track widths are the same - both are 80t drives - it's just that DD used 9 sectors per track and HD 18. Is this likely to work? I realise I'll need to find drives with a unit selection jumper on them, so I can set one as 0 and the other as 1; no twists in the cables this far back, & I'm guessing that a twisted cable wouldn't work with a controller that wasn't expecting it...? -- Liam Proven ? Profile: http://www.linkedin.com/in/liamproven Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AOL/AIM/iChat/Yahoo/Skype: liamproven ? LiveJournal/Twitter: lproven MSN: lproven at hotmail.com ? ICQ: 73187508

16 years, 1 month

Tektronix manuals available

by auringer＠tds.net

Hello, I have the following Tek Instruction Manuals sitting here. I would like to free up the space they are consuming. If someone wants to make it worth my while to spend the time shipping them out, I will entertain offers. Otherwise, I will dump them in the recycling. Preference will go to the fewest number of boxes I have to deal with and, of course, compensation offered. I will accept offers until Sunday (28th) evening. I will ship or recycle Monday. Shipping from 53714. Jon -- 7904 Oscilloscope operators 7904 Oscilloscope Service 7A13 Differential Comparator 7A19 Amplifier 7A26 Dual Trace Amplifier 7B92A Dual Time Base 7B80 Time Base 7B85 Delaying Time Base 7M11 50-Ohm Delay Line S-6 Sampling Head S-52 Pulse Generator Head S-53 Trigger Recognizer Head C-5C Camera 2215 Oscilloscope Service P6056/P6057 Probe P6131 Passive Probe P6460 Data Acquisition Probe K212 Portable Instrument Cart 1240 Workbook I also have "data sheets" for the following items: P6063B Passive Probe 200C Scope-Mobile Cart

16 years, 1 month

mewel

by mcl198＠frontiernet.net

Hello, Does anybody have the source code and libarays for the old MEWEL windows interface? I have been looking for this so the source code for a Juki Pick and Place machine can be updated. If there is a fee for this, just let me know. Thanks, Patrick McLeod McLeod Instruments, Ltd. 928-535-6369

16 years, 1 month

Async logic

by julianskidmore＠yahoo.com

Alexey Toptygin wrote: > What's wrong with pulse or async logic designs? I personally find them > fascinating, but I've never gotten to play with an implementation of > one... Are there problems with designing like this that made people switch > to sync designs? Anyone know of any good books on non-synchronous logic > design? Probably the best resources are the Amulet resources from Manchester University. http://intranet.cs.man.ac.uk/apt/async/ In the late 90s they experimented with Asynchronous ARM processors. The difficulty with asynchronous design is that it's far more prone to race hazards than synchronous design. Also, they found that even the simple handshaking protocol they used limits performance. Nevertheless, they do have some advantages, for example their EMF emmissions tend to be evenly spread across a broad spectrum. Incidently, modern synchronous design is far less synchronous than it used to be; high clock rates mean that CPUs are subdivided into differently clocked domains to avoid clock skew. -cheers from julz @p

16 years, 1 month

eBay Oz : Collection of DEC Unibus modules including custom wire-wrap

by unibus＠gmail.com

> > Message: 6 > Date: Tue, 16 Mar 2010 20:12:10 +1100 > From: Nigel Williams <nigel.d.williams at gmail.com> > Subject: eBay Oz : Collection of DEC Unibus modules including custom > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > All sorts of interesting items: TU-60, CM-11, M792 etc > > http://shop.ebay.com.au/pdp11.caps11/m.html?_nkw=&_armrs=1 > > not connected with seller, however I did purchase fanfold paper-tape from > this eBayer. > I'm the seller so blame me.... blatant plug follows :-) I have to clear out my shed so I'll be dumping on eBay.com.au various bits and pieces. Predominantly it will be DEC UNIBUS modules, papertape, CAPS-11 operating system, plus technical documentation. Stuff is coming out in random order. E.g. some of the -K series laboratory modules have been listed but I've only just found the panels and some of the cables. Really only of interest to Australians are the heavy/bulky/delicate items like the PDP-11 system with the LPS-11 / TU60, or FABRI-TEK Model 11 Add-On Memory System, etc., that are being listed as local pickup. There will some Heathkit (H10 papertape readers/punches and a 3400A microcomputer trainer) plus should be some HP GPIB gear. The Tektronix gear has already gone. I do not have any CM-11 card readers, just some of the UNIBUS interface modules. Regards, Garry

16 years, 1 month

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